note 124869 added to datetime.modify

Made a different fixed version using the month not the day <?php function modifyMonth(DateTime $date, string $modificator): DateTime { $destMonth = $date->format('m') + $date->format('Y') * 12 + ($modificator); $date->modify("$modificator months"); while ($date->format('m') + $date->format('Y') * 12 > $destMonth) $date->modify('-1 day'); return $date; } ?> Testing : <?php $dates = [ ['2020/02/29', '+1', '2020/03/29'], ['2020/02/29 12:34', '-1', '2020/01/29 12:34'], ['2020/03/29 01:01', '+1', '2020/04/29 01:01'], ['2020/03/29', '-1', '2020/02/29'], ['2020/03/30', '+1', '2020/04/30'], ['2020/03/30 23:58', '-1', '2020/02/29 23:58'], ['2020/03/31', '+1', '2020/04/30'], ['2020/03/31', '-1', '2020/02/29'], ['2020/03/31', '+2', '2020/05/31'], ['2020/03/31 00:01', '-2', '2020/01/31 00:01'], ['2020/03/01', '+1', '2020/04/01'], ['2020/03/01', '-1', '2020/02/01'], ['2020/02/01', '+1', '2020/03/01'], ['2020/02/01', '-1', '2020/01/01'], ['2020/04/01', '+1', '2020/05/01'], ['2020/04/01 22:22', '-1', '2020/03/01 22:22'], ['2020/12/31', '+2', '2021/02/28'], ['2020/01/31', '-2', '2019/11/30'], ]; foreach ($dates as $date) { $test = new DateTime($date[0]); modifyMonth($test, $date[1]); if ($test != new DateTime($date[2])) echo $date[0] . " " . $date[1] . " != " . $test->format('c') . "\n"; } ?> Testing prints no error ---- Server IP: 45.112.84.4 Probable Submitter: 185.85.3.195 (proxied: 2a01:cb1d:8231:8400:9809:62e:134a:26ad) ---- Manual Page -- http://php.net/manual/en/datetime.modify.php Edit -- https://master.php.net/note/edit/124869 Del: integrated -- https://master.php.net/note/delete/124869/integrated Del: useless -- https://master.php.net/note/delete/124869/useless Del: bad code -- https://master.php.net/note/delete/124869/bad+code Del: spam -- https://master.php.net/note/delete/124869/spam Del: non-english -- https://master.php.net/note/delete/124869/non-english Del: in docs -- https://master.php.net/note/delete/124869/in+docs Del: other reasons-- https://master.php.net/note/delete/124869 Reject -- https://master.php.net/note/reject/124869 Search -- https://master.php.net/manage/user-notes.php